Automatic heat control



Mar.27, 1923. 1,450,125

v M. L. WEBB AUTOMATIC HEAT CONTROL Filed March 14, 1921 alito; m', 1j

Patented Mar. 27, 1923.

ICE

MAURICE L. WEBB, OF BLACKWELL, OKLAHOMA.

AUTOMATIC HEAT CONTROL.

Application filed March 14, 1921.

To all whom if may concern:

Be it known that I, MAURICE L. lVEBB, a citizen of the Umted States, residing at and useful mprovements in Automatic Heat Controls, of which the following is a specification.

he invention relates to an automatic heat control.

The object of the and to provide a simple, practical and etlicient automatic electric heat control of strong, durable and comparatively inexpensive construction, adapted to be connected in circuit with heater coils and capable of operation by the rotary movement of a shaft to open and close the circuit for causing the re to Oo out and for starting the same.

nother object of the invention is to provide an electric heat control device in which the contacts will be rmly maintained in electrical engagement when the parts are arranged for closing the circuit.

VViththese and other obiects in View the invention consists in the combination and arrangement of parts hereinafter fully described,

in which is the upper and lower arms or portions of the bracket and is threaded at its lower portion into the said base" of the machine. The

preferred embodiment of thek serial No. 452,265.

bracket l which has a limited pivotal movement to o en and close an electric circuit as hereinafter fully explained, has mounted upon it an insulating horizontal support or exterior metallic strips 5 of steel or other suitable material which are adapted to stiffen and brace the liber strips and at the same time f for a cam 6 which is adapted to actuate the pivoted arm or support for opening' the heating circuit. The fiber strips l and the metalic strips 5 are fitted fiat against one another and are arranged with their side faces in vertical planes and they are rigidly secured to the bracket by means of horizontal screws 7 or other suitable fastening devices. fiber strips and the metallic backing strips form a horizontally or member which carries one of a, pair of electrodes or contacts 8 and 9 and the electrode or Contact 8 is movable toward and from the other electrode or contact 9 which is adjustably mounted in a fixed support. The movable contact or electrode 8 is carried by a horizontal screw l() which is mounted for threaded adjustment iii a sleeve 1l iiiteriorly and exteriorly threaded and provided at its inner end with an annular flange or head 13 which lits against the inner fiber or insulating erably threaded into apertures of t-he liber l strips and t-he exterior threads of the sleeve receive a lock mit 14 the sleeve wire 16 to the sleeve, the sleeve ll and the screw 10 forming electrical connections between the contact or electi'ode 8 and the cable or conductor wire 16.

preferably by being threaded on the outer end of tlie screw and secured against relative rotary movement by means of a pin or key 18. The knurled head enables the screw l0 to be. readily adjusted to move the electrode or contact 8 inwardly and outwardly with respect to the insulating supporting arm or member.

The electrodes or contacts 8 and 9 are preferably cylindrical at their outer porstrip et. The sleeve 11 is prefon the outerV a the cables to strips of the insulating" arm or tions and tapered and truncated at their inner contacting portions and the lined adjustable contact or electrode 9 is supported by a horizontal screw 19 which is mounted in openings in insulating disks o-r washers 20, 2l and 22 of fiber or any other suitable Ainsulating material. The insulating washer 20 is arranged in an opening in an upwardly extending arm of a substantially L- shaped bracket or support 28 which is secured by a screw 24C or other suitable fastening'deviceto the frame of the machine and the insulating` washers 2l and QQare arranged at the 'inner and outer faces of the outwardly extending portion of the l.- shaped bracket 23. The contact or electrode 9 which forms a head for the inner end of thel screw 19 tits against the inner insulating washer 2l and the terminal portion 25 of a cable or conducting wire 26 is clamped against the outer insulating washers 2Q by a clamping nut 27 threaded portion of the screw i9.` By mounting ol the screw in the insulating washers 20, 21 and 22 insulates the screw from the supporting bracket 23 andthe screw 19 forms the electrical connection between the' cable or conducting wire 26 and the contact point or electrode 9.'

The cables or conducting wires are connected with heater coils (not shown) and when the electrodes or contacts are in electrical engagement or contact with each other, the circuit is closed and flows through the heater coils for starting the lire and when the electrodes or contacts S and 9 are separated the current is broken and the lire is caused to be extinguished. The cam 6 is preferably formed integral with a collar -or sleeve 28 which is secured on a vertical shaft 29 by a screw 30 or other suitable fastening means and when the shaft is rotated the cam 6 is carried into and out of engagement with the inner steel plate 5 of the' insulating supporting arm or member. The cam 6 is adapted to swing the insulating supporting arm or member outwardly for separating the electrodes or contacts to open thev circuit and when the cam G, by the rotation of the shaft 29, is carried out of engagement with the said insulating supporting arm or member or in al direction. to admit of inward movement of the same the said insulating arm or member is moved inwardly by a coiled spring 3l to carry the electrode or contact'S into electrical engagement with the electrode orrcontact 9 for closing the circuit. @ne end ofthe coiled spring 3lV is hookedinto an aperture of the supporting bracket 23 and the other end is hooked into an' aperture of one of the fiber member but the spring may be connected with the said parte in any other desired manner and it will be apparent that employing the in the opposite spring and the cam for operating insulating arm or memberthat the electric heat control will operate in any position and the shaft 29 is adapted to be manually operated or may be connected with automatic means for partially rotating it to maintain the temperature at a predetermined degree. While the device is described as an automatic heat control it may be of course employed for various purposes for opening and closing an electric circuit.

`What is claimed is:

l. A device of the class described including fixed and movable transversely disposed electrodes or contacts, insulated means for supporting the fixed electrode or contact, an insulating arm or member disposed longitudinally carrying the movable electrode or contact andr comprising a pivoted bracket, insulating strips fitted together and secured to the bracket and exterior metallic strips backing the insulating strips and also secured to the said bracket, means for urging the arm or member in one direction and a shaft provided with a cam intermediate of the ends of theA arm and arranged to engage one. of the metallic strips for positiifely'moving the arm or member direction.

il device of the class described, including a pivoted bracket, an insulating arm or member secured to the bracket and comprising a plurality of strips of insulating material and backing strips of metal, an interiorly threaded sleeve piercing the insulating strips and carried by the said arm or member, an adjustable screw mounted in the threaded sleeve and provided with a contact or electrode, a fixed contact or electrode arranged to be engaged by the said contact or electrode, insulating means for supporting the fixed contact or electrode and means for moving the arm or member to carry the movable contact or electrode into and out of engagement with the fixed contact o-r electrode. L

3. device of the class described including pivoted insulating arm or member, an interiorly and exteriorly threaded sleeve piercing the insulating arm or member, a clamping nut mounted. -on the sleeve for securing the same and a conductor to the said arm or member, an adjusting screw mounted in the sleeve and provided with a movable contact or electrode, a fixed Contact or electrode arranged to be engaged by the said contactor electrode, means for supporting and insulating the lined Contact or and for connecting a conductor therewith and means foi1 operating the` pivoted arm' toA engage the electrodes or contacts witlreach` other and to separate the same,

ln testimony whereof l have hereunto set located 

